Biogeosciences
Biogeosciences
BG
Articles | Volume 22, issue 17
Articles | Volume 22, issue 17
https://doi.org/10.5194/bg-22-4387-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4387-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 17
Research article
 | 
04 Sep 2025
Research article |  | 04 Sep 2025

A national-scale redox clustering for quantifying CO2 emissions from groundwater denitrification

Hyojin Kim, Julian Koch, Birgitte Hansen, and Rasmus Jakobsen

Related authors

CAMELS-DK: hydrometeorological time series and landscape attributes for 3330 Danish catchments with streamflow observations from 304 gauged stations
Jun Liu, Julian Koch, Simon Stisen, Lars Troldborg, Anker Lajer Højberg, Hans Thodsen, Mark F. T. Hansen, and Raphael J. M. Schneider
Earth Syst. Sci. Data, 17, 1551–1572, https://doi.org/10.5194/essd-17-1551-2025,https://doi.org/10.5194/essd-17-1551-2025, 2025
Short summary
Data-driven modelling of hydraulic-head time series: results and lessons learned from the 2022 Groundwater Time Series Modelling Challenge
Raoul A. Collenteur, Ezra Haaf, Mark Bakker, Tanja Liesch, Andreas Wunsch, Jenny Soonthornrangsan, Jeremy White, Nick Martin, Rui Hugman, Ed de Sousa, Didier Vanden Berghe, Xinyang Fan, Tim J. Peterson, Jānis Bikše, Antoine Di Ciacca, Xinyue Wang, Yang Zheng, Maximilian Nölscher, Julian Koch, Raphael Schneider, Nikolas Benavides Höglund, Sivarama Krishna Reddy Chidepudi, Abel Henriot, Nicolas Massei, Abderrahim Jardani, Max Gustav Rudolph, Amir Rouhani, J. Jaime Gómez-Hernández, Seifeddine Jomaa, Anna Pölz, Tim Franken, Morteza Behbooei, Jimmy Lin, and Rojin Meysami
Hydrol. Earth Syst. Sci., 28, 5193–5208, https://doi.org/10.5194/hess-28-5193-2024,https://doi.org/10.5194/hess-28-5193-2024, 2024
Short summary
A national-scale hybrid model for enhanced streamflow estimation – consolidating a physically based hydrological model with long short-term memory (LSTM) networks
Jun Liu, Julian Koch, Simon Stisen, Lars Troldborg, and Raphael J. M. Schneider
Hydrol. Earth Syst. Sci., 28, 2871–2893, https://doi.org/10.5194/hess-28-2871-2024,https://doi.org/10.5194/hess-28-2871-2024, 2024
Short summary
Assessing the impact of climate change on landslides near Vejle, Denmark, using public data
Kristian Svennevig, Julian Koch, Marie Keiding, and Gregor Luetzenburg
Nat. Hazards Earth Syst. Sci., 24, 1897–1911, https://doi.org/10.5194/nhess-24-1897-2024,https://doi.org/10.5194/nhess-24-1897-2024, 2024
Short summary
An inter-comparison of approaches and frameworks to quantify irrigation from satellite data
Søren Julsgaard Kragh, Jacopo Dari, Sara Modanesi, Christian Massari, Luca Brocca, Rasmus Fensholt, Simon Stisen, and Julian Koch
Hydrol. Earth Syst. Sci., 28, 441–457, https://doi.org/10.5194/hess-28-441-2024,https://doi.org/10.5194/hess-28-441-2024, 2024
Short summary
More articles (3)

Cited articles

Adhikari, K., Kheir, R. B., Greve, M. B., Bøcher, P. K., Malone, B. P., Minasny, B., McBratney, A. B., and Greve, M. H.: High-Resolution 3-D Mapping of Soil Texture in Denmark, Soil Sci. Soc. Am. J., 77, 860–876, https://doi.org/10.2136/sssaj2012.0275, 2013. 
Adhikari, K., Hartemink, A. E., Minasny, B., Bou Kheir, R., Greve, M. B., and Greve, M. H.: Digital Mapping of Soil Organic Carbon Contents and Stocks in Denmark, PLoS One, 9, e105519, https://doi.org/10.1371/journal.pone.0105519, 2014. 
Appelo, C. A. J. and Postma, D.: Geochemistry, Groundwater and Pollution, edited by: Appelo, C. A. J. and Postma, D., CRC Press, https://doi.org/10.1201/9781439833544, 2005. 
Ascott, M. J., Gooddy, D. C., Wang, L., Stuart, M. E., Lewis, M. A., Ward, R. S., and Binley, A. M.: Global patterns of nitrate storage in the vadose zone, Nat. Commun., 8, 1–6, https://doi.org/10.1038/s41467-017-01321-w, 2017. 
Barak, P., Jobe, B. O., Krueger, A. R., Peterson, L. A., and Laird, D. A.: Effects of long-term soil acidification due to nitrogen fertilizer inputs in Wisconsin, Plant Soil, 197, 61–69, https://doi.org/10.1023/A:1004297607070, 1997. 
More articles (64)
Download
Short summary

Nitrate pollution from farming is a global problem. A natural process called denitrification helps remove nitrate but also releases CO2, which contributes to climate change. Our study shows that CO2 from this process in Danish groundwater may be a major overlooked source – similar to other known agricultural CO2 emissions. This highlights the need to update greenhouse gas reporting to better reflect farming’s full climate impact.

Read more
Share
Altmetrics
Final-revised paper
Preprint